code: def agg_axes(self):
      s = self.indices.axes.copy()
      for a in self.nested:
          s = s.union(a.agg_axes())
      return s
  
file_path: hail/hail/python/hail/expr/expressions/indices.py
imports: from hail.typecheck import typecheck_method, anytype, setof
  import hail
  from typing import List
label_desc: Use image node_id 2 for calling the Aggregation obj's underlying member method code with example usage: obj.agg_axes() and returns: s